Circuit for eliminating spurious components resulting from burst

Details Circuit for eliminating spurious components resulting from burst Circuit for eliminating spurious components resulting from burst

1982-01-11

1984-11-13

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370104, H04J 316

Patent

active

044830009

ABSTRACT:
In an electronic circuit comprising a modulator (35) and used in each substation of a TDMA system and responsive to a baseband data signal sequence for producing a burst in accordance with a first burst control pulse, spurious components resulting in the burst from the first burst control pulse are eliminated either by allowing the data sequence to pass through a low-pass filter (36) after switching (45) the sequence by the first burst control pulse or by filtering the first burst control pulse by a low-pass filter before switching a local oscillation signal by the first control pulse. An additional switching circuit may switch either a modulated signal supplied from the modulator or the local oscillation signal in response to a second burst control pulse that disappears after extinction of the first burst control pulse. Alternatively, a modifying circuit reverses polarities of a preceding and a following data signals immediately preceding and following the sequence, relative to a leading and a trailing end data signals of the sequence.

REFERENCES:
patent: 3683116 (1972-08-01), Dill
patent: 3777269 (1973-12-01), Brady
patent: 3909750 (1975-09-01), Brady
patent: 4384364 (1983-05-01), Henning
A. Jefferis et al., "Simplified TDMA system for International Applications", Int. Conf. on Dig. Sat. Comm., Oct. 1978, pp. 341-345.
C. Cuccia, "Phase Synchronization of Digitally Modulated Burst Carriers in TDMA Systems-A Technology Overview", IEEE MTT-S Inter. Microwave Symposium Digest 1979, Apr.-May 1979, pp. 519-521.
K. Kato et al., "Hardware Evaluation of PSK Modern through Non-Linear Satellite Channel", ICC 1980, Internat. Confer. on Comm., Jun. 1980, p. 36.5.1.
H. Claadwick et al., "Performance of a TDMA Burst Modern through a Dual Nonlinear Satellite Channel", 5th Internat. Conf. on Dig. Satellite Comm., Mar. 1981, pp. 63-67.
Sakamoto et al., "PCM-TDMA Satellite Communications Equipment", Fujitsu Sci. & Tech. Journal, Dec. 1974, p. 20.

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